Hose for use in the transport of refrigerants

Abstract

A hose useful for handling low temperature fluids such as refrigerants is disclosed, which exhibits excellent resistance to ozone and moisture permeation. A cover or outermost tube of the hose is formed from a vulcanizate of a rubber composition comprising a first copolymer rubber having an isobutylene unit and a p-halogenated methylstyrene unit and/or a second copolymer rubber having an isobutylene unit, a p-halogenated methylstyrene unit and a p-methylstyrene unit.

What is claimed is: 
     
       1. A hose for use in the transport of refrigerants and having high resistance to weather and moisture, said hose having at least a core tube, a reinforcing layer over said core tube and a cover tube over said reinforcing layer, at least said cover tube being formed from a vulcanizate of a rubber composition comprising a first copolymer rubber having an isobutylene unit and a p-halogenated methylstyrene unit, a second copolymer rubber having an isobutylene unit, a p-halogenated methylstyrene unit and a p-methylstryrene unit or a mixture of said copolymer rubbers, and wherein the proportion of said p-halogenated methylstyrene unit in said first copolymer rubber and the proportion of the sum of p-halogenated methylstyrene unit and p-methylstyrene unit in said second copolymer unit is 1-20 percent by weight of the respective copolymer rubbers. 
     
     
       2. A hose according to claim 1 wherein said first copolymer rubber is represented by the formula ##STR5## wherein X represents a halogen atom. 
     
     
       3. A hose according to claim 1 wherein said second copolymer rubber is represented by the formula ##STR6## wherein X represents a halogen atom. 
     
     
       4. A hose according to claim 2 or 3 wherein said first and second copolymer rubbers each contains 0.2-2.2 percent by weight of halogen.